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ni fe catalyst
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     The interaction of Ni-B and Fe-B are prominent.
     Ni-B、Fe-B键间有强烈相互作用;
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     Fe?
     Fe?
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     Ni
     Ni;
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     Fe?
     采用共沉淀法进行了Fe?
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     Trend of Fe-Ni accumulator
     铁-镍蓄电池开发动向
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  ni fe catalyst
However, nanotubes grown over alumina supported Ni/Fe catalyst were less dense due to the deactivation of the catalyst at the early stage of the pyrolysis process.
      
It was found that alumina supported Ni/Fe catalyst inhibited the formation of CNTs growth while alumina supported Ni/Co catalyst gave high density of CNTs.
      


The structures of nickel, iron and Ni-Fe Bimetallic catalysts supported on alumina and silica were characterized by EXAFS, XRD. The nickel reduction peak temperature of catalysts affected by support and adding iron oxide was studied with TPR, the results indicate that interaction between metal and support on alumina is stronger than that on silica. Both nickel and iron form Ni-Fe alloy particles in Ni-Fe bimetallic catalysts. The activity of CO_2 methanation...

The structures of nickel, iron and Ni-Fe Bimetallic catalysts supported on alumina and silica were characterized by EXAFS, XRD. The nickel reduction peak temperature of catalysts affected by support and adding iron oxide was studied with TPR, the results indicate that interaction between metal and support on alumina is stronger than that on silica. Both nickel and iron form Ni-Fe alloy particles in Ni-Fe bimetallic catalysts. The activity of CO_2 methanation is lower in the fcc structural α-Fe, but there is a highly activity for the fcc structural Fe in the Ni-Fe catalysts, comparable to the activity of nickel catalysts. It is interpreted that the distance between the iron atom and the neighbor atom at the first layer of surface is 2.87A in bcc structural α-Fe, which is 0.39A longer than that of fcc structural Fe, so the bcc α-Fe is diffcult to disociate H_2. The activity of Ni-Fe SiO_2 catalyst is many times lower than that of Ni-Fe/η-A1_2O_3 catalyst at the same reaction temperature. It was believed that iron is more rich and exists some property of the bcc α-Fe on the surface of Ni-Fe alloy particles in the Ni-Fe SiO_2 catalyst.

本文用EXAFS、XRD实验方法研究了负载在η-Al_2O_3和Si_2载体上的镍、铁金属及Ni-Fe双全属催化剂的结构,TPR技术考察载体和加入的第二组分铁对镍还原峰温度的影响。结果表明η-Al_2O_3载体与金属的相互作用比相应SiO_2的大,Ni-Fe双金属催化剂形成镍铁合金晶粒.bcc结构α-Fe的CO_2加氢甲烷化活性很低,Ni-Fe双金属催化剂中fcc结构铁的活性相当高,与镍的活性相近,认为是bcc结构α-Fe的表面层铁原子间距离2.87A,较fcc结构铁的长0.39A,使H_2难于形成的解离吸附所致。在相同反应温度下Ni-Fe/SiO_2催化剂的活性比Ni-Fe/η-Al_2O_3催化剂的小几倍的主要原因是Ni-Fe/SiO_2催化剂的Ni-Fe合金晶粒中铁在表面偏析的程度大和仍带有部分bcc结构α-Fe的性质。

Catalytic generation of hydrogen by partial oxidation of ethanol over a series of Ni Fe catalysts has been studied.The catalytic performances have been investigated over various O2/C2H5OH molar ratio at 473~573 K.These Ni Fe catalysts showed high performances for the partial oxidation of ethanol to hydrogen and Ni50Fe50 catalyst had the best activity when reaction temperature was between 548K and 573 K.The optimum reaction conditions for Ni50Fe50...

Catalytic generation of hydrogen by partial oxidation of ethanol over a series of Ni Fe catalysts has been studied.The catalytic performances have been investigated over various O2/C2H5OH molar ratio at 473~573 K.These Ni Fe catalysts showed high performances for the partial oxidation of ethanol to hydrogen and Ni50Fe50 catalyst had the best activity when reaction temperature was between 548K and 573 K.The optimum reaction conditions for Ni50Fe50 catalyst are O2/C2H5OH =1.0、T=573 K.The fresh and used catalysts were characterized by XRD and XPS.The XRD patterns showed the main components of the active catalysts are the spinal type structure of magnetite and FeNi3 alloy(see Fig.4).The decrease in the selectivity for hydrogen of the catalyst may be resulted from the conversion of FeNi3 alloy phase in the catalyst during long term reaction(see Fig.5).XPS results confirmed that the phase of the bulk catalyst is mainly FeNi3 alloy and that of the surface catalyst is mainly magnetite (see Fig 6).

研究了Ni-Fe催化剂对乙醇部分氧化制氢反应,系统地考察了不同O2/C2H5OH摩尔比及反应温度下催化剂的性能.发现Ni-Fe催化剂对乙醇部分氧化制氢具有较好的催化活性,其中组成为Ni50Fe50催化剂最好,最佳的反应条件是O2/C2H5OH=1.0,T=573K.XRD谱图表明催化剂主要由尖晶石结构的铁酸盐和FeNi3合金相组成.XPS结果说明,催化剂体相以还原态FeNi3合金相为主,表面以氧化态的铁酸盐为主.稳定性考察的结果表明,催化剂经40h反应后,对氢的选择性明显下降,此时对应的FeNi3物相衍射峰强度也明显降低,表明催化剂对H2选择性的下降与FeNi3物相的转变有关.

Catalytic decomposition of unsymmetrical dimethylhydrazine(UDMH) in wastewater on Ni/Fe catalysts was studied, and the effects of the content of the catalysts, pH values of the system and the initial concentration of UDMH were investigated. The results showed that the catalysts exhibited high activities for the ozonation of UDMH. The content of the catalysts, pH values of the system and the initial concentration of UDMH give little effects on the performance of the catalysts....

Catalytic decomposition of unsymmetrical dimethylhydrazine(UDMH) in wastewater on Ni/Fe catalysts was studied, and the effects of the content of the catalysts, pH values of the system and the initial concentration of UDMH were investigated. The results showed that the catalysts exhibited high activities for the ozonation of UDMH. The content of the catalysts, pH values of the system and the initial concentration of UDMH give little effects on the performance of the catalysts. The catalysts are characterized by X-ray diffraction(XRD) and the results showed that the main components of the catalysts were the spinal-type structure of magnetite and FeNi3 alloy. The high performance of the catalysts for the ozonation of UDMH may be resulted from the formation of the spinal-type structure of magnetite and the FeNi3 alloy.

研究了Ni/Fe催化剂对废水中偏二甲肼臭氧化分解的催化作用,考察了组分含量、体系的pH值和偏二甲肼初始浓度对催化反应的影响.结果表明,Ni/Fe催化剂对水中偏二甲肼的臭氧化具有良好的催化活性.催化剂组分含量、体系的pH值和初始浓度对反应的影响程度不大.对催化剂的XRD表征结果表明,催化剂主要由尖晶石结构的铁酸盐和FeNi3合金相组成,催化剂的良好催化性能与催化剂中尖晶石结构的铁酸盐和FeNi3合金相的形成有关.

 
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